用r.js来打包模块化的js文件实例讲解

零下一度
Lepaskan: 2017-06-26 11:28:11
asal
1354 orang telah melayarinya

前面的话

  r.js(下载)是requireJS的优化(Optimizer)工具,可以实现前端文件的压缩与合并,在requireJS异步按需加载的基础上进一步提供前端优化,减小前端文件大小、减少对服务器的文件请求。本文将详细介绍r.js

 

简单打包

【项目结构】

  以一个简单的例子来说明r.js的使用。该项目名称为'demo',在js目录下包含s1.js和s2.js两个文件,使用requirejs进行模块化,内容如下

//s1.jsdefine(function (){return 1;
})//s2.jsdefine(function (){return 2;
})
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  使用main.js来调用s1.js和s2.js这两个文件

require(['s1','s2'], function(a,b){
  console.log(a+b);
});
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  index.html的内容如下

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script data-main="js/main" src="js/require.js?1.1.11"></script>
</head>
<body>
</body>
</html>
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  运行index.html文件,所依赖资源如下图所示

 【打包】

  接下来,使用r.js来对javascript文件进行打包,而r.js需要使用build.js文件来进行配置,配置如下

({
    baseUrl: "./",
      name:'main',
    out:'out.js'})
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  接下来运行node r.js -o build.js命令

  项目根目录下,生成一个out.js文件,内容如下

define("s1",[],function(){return 1}),define("s2",[],function(){return 2}),require(["s1","s2"],function(n,e){console.log(n+e)}),define("main",function(){});
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  将index.html的入口文件修改为'out.js',文件依然能正常运行

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <script data-main="js/out" src="js/require.js?1.1.11"></script>
</head>
<body>
</body>
</html>
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jQuery打包

  一般地,我们并不是使用原生javascript进行开发,更多的使用库进行高效开发,以jQuery为例,对上面的代码进行改造

  s1模块和s2模块,分别基于jQuery来获取页面div元素的宽、高,内容如下

//s1.jsdefine(['../common/jquery'],function (){return $('div').height();
})//s2.jsdefine(['../common/jquery'],function (){return $('div').width();
})
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  项目结构如下所示,js文件夹包括common和module两个子文件夹,common文件夹包含公用的require.js和jquery.js,module文件夹包含模块s1.js和s2.js。页面的根目录下,有index.html、入口文件main.js、以及r.js和build.js

【包含jQuery】

  如果打包后的main.js要包含jQuery.js,则代码如下所示

({ 
    appDir: './',   //项目根目录dir: './dist',  //输出目录,全部文件打包后要放入的文件夹(如果没有会自动新建的)baseUrl:'./',
    modules: [  //要优化的模块,相对baseUrl的路径,也是省略后缀“.js”{ name:'main' }   
    ],  
    fileExclusionRegExp: /^(r|build)\.js|.*\.scss$/,    //过滤,匹配到的文件将不会被输出到输出目录去optimizeCss: 'standard',  
    removeCombined: true  //如果为true,将从输出目录中删除已合并的文件})
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  打包后的main.js内容如下所示

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tt=/<(?!area|br|col|embed|hr|img|input|link|meta|param)(([a-z][^\/\0>\x20\t\r\n\f]*)[^>]*)\/>/gi,nt=/<script|<style|<link/i,rt=/checked\s*(?:[^=]|=\s*.checked.)/i,it=/^true\/(.*)/,ot=/^\s*<!(?:\[CDATA\[|--)|(?:\]\]|--)>\s*$/g;ge.extend({htmlPrefilter:function(e){return e.replace(tt,"<$1></$2>")},clone:function(e,t,n){var r,i,o,a,s=e.cloneNode(!0),u=ge.contains(e.ownerDocument,e);if(!(de.noCloneChecked||1!==e.nodeType&&11!==e.nodeType||ge.isXMLDoc(e)))for(a=v(s),o=v(e),r=0,i=o.length;r<i;r++)D(o[r],a[r]);if(t)if(n)for(o=o||v(e),a=a||v(s),r=0,i=o.length;r<i;r++)N(o[r],a[r]);else N(e,s);return 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e=ne.createElement("input"),t=ne.createElement("select"),n=t.appendChild(ne.createElement("option"));e.type="checkbox",de.checkOn=""!==e.value,de.optSelected=n.selected,e=ne.createElement("input"),e.value="t",e.type="radio",de.radioValue="t"===e.value}();var xt,bt=ge.expr.attrHandle;ge.fn.extend({attr:function(e,t){return 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【不包含jQuery】

  如果其他页面也需要用到jQuery,它们打包的时候,也会把jQuery打包。这样,相当于每个页面都打包了一次jQuery,性能很差。更好的做法是,不打包jQuery,其他页面引用jQuery时,就可以使用缓存了。

  build.js内容如下所示

({ 
    appDir: './',   //项目根目录dir: './dist',  //输出目录,全部文件打包后要放入的文件夹(如果没有会自动新建的)baseUrl:'./',
    modules: [  //要优化的模块,相对baseUrl的路径,也是省略后缀“.js”        { 
            name:'main',
            exclude: ['js/common/jquery']//不打包jQuery        }   
    ],  
    fileExclusionRegExp: /^(r|build)\.js|.*\.scss$/,    //过滤,匹配到的文件将不会被输出到输出目录去optimizeCss: 'standard',  
    removeCombined: true  //如果为true,将从输出目录中删除已合并的文件})
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  接下来运行node r.js -o build.js命令

  运行后,生成一个'dist'文件夹,该文件夹包含的文件都是处理过后的文件,适合上线

  打包后的main.js内容如下所示

define("js/module/s1",["../common/jquery"],function(){return $("div").height()}),define("js/module/s2",["../common/jquery"],function(){return $("div").width()}),require(["js/module/s1","js/module/s2"],function(e,n){console.log(parseInt(e)+parseInt(n))}),define("main",function(){});
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